Synonyms: Lendemeriella lucifuga (G. Thor) S. Y. Kondr.
Distribution: N - VG, Piem (TSB 33493), Lig (Brunialti & al. 2001). C - Tosc, Umb (Ravera 2000, Ravera & al. 2006), Laz, Abr, Mol (Herb. Ravera 4803), Sar (Zedda 1995, 2002, 2002b). S - Pugl (Nimis & Tretiach 1999), Cal (Puntillo 1995, 1996, Incerti & Nimis 2006).
Description: Thallus crustose, endosubstratic or thinly episubstratic, inconspicuous or visible as a thin grey film with scattered small warts. Soralia numerous, 0.15–0.35 mm in diam., forming from a break-up of warts, pale yellow, yellowish grey to dirty orange-brown (greenish in shade-forms), at first well-delimited, but sometimes confluent, initially flat, then often convex. Soredia granular or farinose 17-24 μm in diam. Apothecia unknown. Photobiont chlorococcoid, the cells 7-14 μm diam., arranged in clusters. Spot tests: thallus K- of K+ yellow, C-, KC-, P-; soralia K+ violet-red or rarely K-(anthraquinones may be absent in green soralia from shaded situations). Chemistry: anthraquinones in the soredia (parietin and fallacinal).
Note: a temperate species found on ancient, more or less isolated deciduous trees, especially oaks or Castanea, often in crevices of rough bark and on faces seldom wetted by rain. It is included in the Italian red list of epiphytic lichens under the “Least Concern” category (Nascimbene & al. 2013c).
Growth form: Crustose
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)